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Pylaecephalidae Temporal range: Permian
Fossil of Diictodon
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Clade:	Therapsida
Suborder:	†Anomodontia
Clade:	†Dicynodontia
Family:	†Pylaecephalidae van Hoepen, 1934
Type genus
†Pylaecephalus Van Hoepen, 1934
Genera
†Diictodon †Eosimops †Prosictodon †Robertia
Synonyms
Diictodontidae Cluver and King, 1983 Robertiidae Cluver and King, 1983

Pylaecephalidae is a family of dicynodont therapsids that includes Diictodon, Robertia, and Prosictodon from the Permian of South Africa. Pylaecephalids were small burrowing dicynodonts with long tusks. The family was first named in 1934 and was redefined in 2009. Diictodontidae and Robertiidae are considered junior synonyms of Pylaecephalidae; although Pylaecephalus itself is considered a junior synonym of Diictodon, the name Pylaecephalidae predates these names and therefore takes priority.

Phylogeny

Below is a cladogram modified from Angielczyk et al. (2021):

References

1. ^ Kammerer, C.F.; Angielczyk, K.D. (2009). "A proposed higher taxonomy of anomodont therapsids" (PDF). Zootaxa. 2018: 1–24.
2. Kenneth D. Angielczyk; Bruce S. Rubidge (2010). "A new pylaecephalid dicynodont (Therapsida, Anomodontia) from the Tapinocephalus Assemblage Zone, Karoo Basin, Middle Permian of South Africa". Journal of Vertebrate Paleontology. 30 (5): 1396–1409. Bibcode:2010JVPal..30.1396A. doi:10.1080/02724634.2010.501447. S2CID 129846697.
3. Sullivan, C., & Reisz, R. R. (2005). CRANIAL ANATOMY AND TAXONOMY OF THE LATE PERMIAN DICYNODONT DIICTODON. Annals of Carnegie Museum, 74(1), 45–75.
4. Angielczyk, K. D.; Liu, J.; Yang, W. (2021). "A Redescription of Kunpania scopulusa, a Bidentalian Dicynodont (Therapsida, Anomodontia) from the ?Guadalupian of Northwestern China". Journal of Vertebrate Paleontology. 41: e1922428. Bibcode:2021JVPal..41E2428A. doi:10.1080/02724634.2021.1922428. S2CID 236406006.

v t e Anomodontia
Kingdom: Animalia Phylum: Chordata Clade: Synapsida Clade: Therapsida Synapsida see Synapsida Anomodontia see below↓
Anomodontia Anomodontia Biseridens Novocynodon? Anomocephaloidea Anomocephalus Tiarajudens Venyukovioidea Otsheria Parasuminia Suminia Ulemica Venyukovia Chainosauria Galechirus Galeops Galepus Patranomodon Anomocephaloidea? Dicynodontia see below↓
Dicynodontia Dicynodontia Brachyprosopus Colobodectes Eodicynodon Lanthanostegus Nyaphulia Pristerodon Pylaecephalidae Diictodon Eosimops Prosictodon Robertia Endothiodontia Abajudon Endothiodon Niassodon Therochelonia Emydopoidea Digalodon Emydorhinus? Palemydops? Emydopidae Compsodon Emydops Myosauridae Myosauroides Myosaurus Kingoriidae Dicynodontoides Kombuisia Thliptosaurus Cistecephalidae Cistecephaloides Cistecephalus Kawingasaurus Kembawacela Sauroscaptor Bidentalia see below↓
Bidentalia Bidentalia Daqingshanodon Idelesaurus Keyseria Odontocyclops Rastodon Syops Elphidae Elph Interpresosaurus Katumbia Geikiidae Aulacephalodon Bulbasaurus Geikia Pelanomodon Oudenodontidae Australobarbarus Oudenodon Tropidostoma Rhachiocephalidae Kitchinganomodon Rhachiocephalus Dicynodontoidea Counillonia Daptocephalus Delectosaurus Dicynodon Dinanomodon Gordonia Kunpania Peramodon Repelinosaurus Taoheodon Turfanodon Vivaxosaurus Lystrosauridae Basilodon? Euptychognathus? Jimusaria? Kwazulusaurus Lystrosaurus Sintocephalus? Kannemeyeriiformes see below↓
Kannemeyeriiformes Kannemeyeriiformes Angonisaurus Dinodontosaurus Elephantosaurus Woznikella Shansiodontidae Shansiodon Tetragonias Vinceria Rhinodicynodon Kannemeyeriidae Acratophorus Dolichuranus Kannemeyeria Parakannemeyeria Rabidosaurus Rechnisaurus Rhadiodromus Shaanbeikannemeyeria Sinokannemeyeria Uralokannemeyeria Wadiasaurus Xiyukannemeyeria Stahleckeriidae Sungeodon Placeriinae Argodicynodon Lisowicia Moghreberia Pentasaurus Placerias Zambiasaurus Stahleckeriinae Eubrachiosaurus Ischigualastia Jachaleria Sangusaurus Stahleckeria Ufudocyclops
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